ocfs2: fix several issues of append dio
[linux/fpc-iii.git] / drivers / scsi / fnic / vnic_wq.h
blob5cd094f79281c66fa58c56ec963de9ae71a73786
1 /*
2 * Copyright 2008 Cisco Systems, Inc. All rights reserved.
3 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
5 * This program is free software; you may redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; version 2 of the License.
9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
16 * SOFTWARE.
18 #ifndef _VNIC_WQ_H_
19 #define _VNIC_WQ_H_
21 #include <linux/pci.h>
22 #include "vnic_dev.h"
23 #include "vnic_cq.h"
26 * These defines avoid symbol clash between fnic and enic (Cisco 10G Eth
27 * Driver) when both are built with CONFIG options =y
29 #define vnic_wq_desc_avail fnic_wq_desc_avail
30 #define vnic_wq_desc_used fnic_wq_desc_used
31 #define vnic_wq_next_desc fni_cwq_next_desc
32 #define vnic_wq_post fnic_wq_post
33 #define vnic_wq_service fnic_wq_service
34 #define vnic_wq_free fnic_wq_free
35 #define vnic_wq_alloc fnic_wq_alloc
36 #define vnic_wq_init fnic_wq_init
37 #define vnic_wq_error_status fnic_wq_error_status
38 #define vnic_wq_enable fnic_wq_enable
39 #define vnic_wq_disable fnic_wq_disable
40 #define vnic_wq_clean fnic_wq_clean
42 /* Work queue control */
43 struct vnic_wq_ctrl {
44 u64 ring_base; /* 0x00 */
45 u32 ring_size; /* 0x08 */
46 u32 pad0;
47 u32 posted_index; /* 0x10 */
48 u32 pad1;
49 u32 cq_index; /* 0x18 */
50 u32 pad2;
51 u32 enable; /* 0x20 */
52 u32 pad3;
53 u32 running; /* 0x28 */
54 u32 pad4;
55 u32 fetch_index; /* 0x30 */
56 u32 pad5;
57 u32 dca_value; /* 0x38 */
58 u32 pad6;
59 u32 error_interrupt_enable; /* 0x40 */
60 u32 pad7;
61 u32 error_interrupt_offset; /* 0x48 */
62 u32 pad8;
63 u32 error_status; /* 0x50 */
64 u32 pad9;
67 struct vnic_wq_buf {
68 struct vnic_wq_buf *next;
69 dma_addr_t dma_addr;
70 void *os_buf;
71 unsigned int len;
72 unsigned int index;
73 int sop;
74 void *desc;
77 /* Break the vnic_wq_buf allocations into blocks of 64 entries */
78 #define VNIC_WQ_BUF_BLK_ENTRIES 64
79 #define VNIC_WQ_BUF_BLK_SZ \
80 (VNIC_WQ_BUF_BLK_ENTRIES * sizeof(struct vnic_wq_buf))
81 #define VNIC_WQ_BUF_BLKS_NEEDED(entries) \
82 DIV_ROUND_UP(entries, VNIC_WQ_BUF_BLK_ENTRIES)
83 #define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(4096)
85 struct vnic_wq {
86 unsigned int index;
87 struct vnic_dev *vdev;
88 struct vnic_wq_ctrl __iomem *ctrl; /* memory-mapped */
89 struct vnic_dev_ring ring;
90 struct vnic_wq_buf *bufs[VNIC_WQ_BUF_BLKS_MAX];
91 struct vnic_wq_buf *to_use;
92 struct vnic_wq_buf *to_clean;
93 unsigned int pkts_outstanding;
96 static inline unsigned int vnic_wq_desc_avail(struct vnic_wq *wq)
98 /* how many does SW own? */
99 return wq->ring.desc_avail;
102 static inline unsigned int vnic_wq_desc_used(struct vnic_wq *wq)
104 /* how many does HW own? */
105 return wq->ring.desc_count - wq->ring.desc_avail - 1;
108 static inline void *vnic_wq_next_desc(struct vnic_wq *wq)
110 return wq->to_use->desc;
113 static inline void vnic_wq_post(struct vnic_wq *wq,
114 void *os_buf, dma_addr_t dma_addr,
115 unsigned int len, int sop, int eop)
117 struct vnic_wq_buf *buf = wq->to_use;
119 buf->sop = sop;
120 buf->os_buf = eop ? os_buf : NULL;
121 buf->dma_addr = dma_addr;
122 buf->len = len;
124 buf = buf->next;
125 if (eop) {
126 /* Adding write memory barrier prevents compiler and/or CPU
127 * reordering, thus avoiding descriptor posting before
128 * descriptor is initialized. Otherwise, hardware can read
129 * stale descriptor fields.
131 wmb();
132 iowrite32(buf->index, &wq->ctrl->posted_index);
134 wq->to_use = buf;
136 wq->ring.desc_avail--;
139 static inline void vnic_wq_service(struct vnic_wq *wq,
140 struct cq_desc *cq_desc, u16 completed_index,
141 void (*buf_service)(struct vnic_wq *wq,
142 struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque),
143 void *opaque)
145 struct vnic_wq_buf *buf;
147 buf = wq->to_clean;
148 while (1) {
150 (*buf_service)(wq, cq_desc, buf, opaque);
152 wq->ring.desc_avail++;
154 wq->to_clean = buf->next;
156 if (buf->index == completed_index)
157 break;
159 buf = wq->to_clean;
163 void vnic_wq_free(struct vnic_wq *wq);
164 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
165 unsigned int desc_count, unsigned int desc_size);
166 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
167 unsigned int error_interrupt_enable,
168 unsigned int error_interrupt_offset);
169 unsigned int vnic_wq_error_status(struct vnic_wq *wq);
170 void vnic_wq_enable(struct vnic_wq *wq);
171 int vnic_wq_disable(struct vnic_wq *wq);
172 void vnic_wq_clean(struct vnic_wq *wq,
173 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf));
175 #endif /* _VNIC_WQ_H_ */